Quite annoying issue that can be experienced when switching between this change and master branch - QtC refuses to compile project with the following error

Source file '/Users/abbapoh/Programming/qt5/alien/qbs/examples/helloworld-minimal/hello.qbs' has disappeared.

Neither "reparse qbs" nor "rebuild all" options help. The only workaround is to close QtC, remove build directory, open QtC.